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Make a deal with Henry Segerman
🔒 Paid proposals held safely in escrow — released only when the work's approved.
Followers
3.8K
Account age
9 yrs
💰 Suggested sponsorship rate
$40 – $65 / sponsored post
Estimated from audience size & typical reach — every deal is negotiable and held in SocialDB escrow.
🎁 Free analysisfor Henry Segerman
Known for
390 views
Here's a second, geared mechanism that transforms between cube and octahedron forms. Full video at https://youtu.be/T9BNMLFHXUw
294 views
New video, on mechanisms that illustrate the duality between the cube and the octahedron! Here's one of them: a linkage with fabric panels designed by @sabetta.
Full video at https://youtu.be/T9BNMLFHXUw
75 views
Earlier this week I was challenged to come up with a mechanism that would illustrate the duality of the cube and the octahedron. I got as far as making this animation before discovering that I was scooped three months ago! The paper (https://www.sciencedirect.com/science/article/pii/S0094114X25002769) by Liao, Kiper, and Krishnan has lots of other interesting mechanisms, including one showing dual
54 views
New video out just now, on a mechanism that uses racks and gears to expand and contract, this time in all three dimensions! https://youtu.be/NEJZlGuWGV8
📊 Post engagement
Recent posts · likes + reposts
Nov 20latest
84
Avg engagement / post
26–54
Typical post (engagement)
2.2%
Engagement vs followers
37/100
Variable reach
Apr 2017
On Mastodon since
Half of recent posts land between 26 and 54 likes + reposts (median 33) — reach is spiky, driven by the occasional post that pops.
🔥 Top post: Here's a second, geared mechanism that transforms between cube a · 390 likes + reposts
📊 Activity & format
Posting cadence
0.38 / week
A lower-frequency account — each post lands with more weight.
Content mix
Mostly video
Recent: 3 text · 4 image · 5 video.
Follower / following
14×
Follows 264 back. A strong ratio — an audience that follows them, not a follow-for-follow network.
Recent posts
View on Mastodon ↗▶
🔥 Top post
Here's a second, geared mechanism that transforms between cube and octahedron forms. Full video at https://youtu.be/T9BNMLFHXUw
I gave a talk at https://www.ias.edu/pcmi yesterday, in which I described this 3D printed knot complement (by François Guéritaud, @saulsch, and me) as what's left after a very well-trained worm tunnels out a knotted hole. Elise Brod was in…
▶
The papers for this year's Bridges math/art conference are out now! I wrote a paper on expanding gadgets based on rack and pinion mechanisms. https://archive.bridgesmathart.org/2026/bridges2026-213.html
The so-called "Fibonacci sequence" was introduced to European mathematicians by Fibonacci, but was first described by the Indian mathematician Pingala over 1400 years earlier. So perhaps we should be calling it the "Pingala sequence".
But …
Here are the files and instructions if anyone wants to make their own version: https://www.printables.com/model/1644298-transforming-cubeoctahedron-geared-mechanism
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New video, on mechanisms that illustrate the duality between the cube and the octahedron! Here's one of them: a linkage with fabric panels designed by @sabetta.
Full video at https://youtu.be/T9BNMLFHXUw
“Homunculus”
▶
Earlier this week I was challenged to come up with a mechanism that would illustrate the duality of the cube and the octahedron. I got as far as making this animation before discovering that I was scooped three months ago! The paper (https…
Minesweeper roguelike I’ve been having a lot of fun with out in full release now: https://store.steampowered.com/app/3473250/BroomSweeper/
▶
New video out just now, on a mechanism that uses racks and gears to expand and contract, this time in all three dimensions! https://youtu.be/NEJZlGuWGV8
Stillwater has a very small airport - only one gate. They fly twice a day to Dallas Fort Worth. This is the first time I’ve ever seen three passenger planes here at the same time! (Exciting, I know.)
The OSU Museum of Art is in a beautiful old building that used to be a post office. They have a small but heavily-fortified room that used to be a safe. Not such a great location to view paintings, but will work nicely for light-based scul…
🐘 Community & instance
Home server
mathstodon.xyz
Their home server on the fediverse — the instance a creator picks signals the community they belong to.
✅ Link-verified
Verified link
Proved ownership of a website linked on their profile — Mastodon's green-check verification, a real identity signal rather than a paid badge.
On Mastodon since
Apr 2017
An OG fediverse account from Mastodon's early years — a long, established presence.
💡 Facts
🗓️Joined Mastodon in 2017 — 9 years ago.
👁️Averages 84 views per post.
📤Posts about 0.4× per week.
🕵️ Fake follower check
Estimated81/100
Excellent
Credibility score
97%
Real
Real audience
Low
Fake-follower risk
High
Data confidence
- Est. 97% real, active audience · Low fake-follower risk.
- Engagement (~2.2% of followers engage each post) is around typical for Mastodon.
- Organic base — far more followers than accounts it follows.
- Verified account.
- Established account (9+ years old).
Heuristic estimate from engagement, follower ratios, account age & growth — a screening signal, not a guarantee.
About
Mathematician working mostly in three-dimensional geometry and topology, and mathematical maker/artist working mostly in 3D printing and virtual reality.
#Math #Maths #Art #3DPrinting #Geometry
📸 Gallery
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EstimatedEstimated shared audience with similar creators — useful for avoiding overlap (or doubling down) when planning a campaign.
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Frequently asked questions
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How many followers does Henry Segerman have?
Henry Segerman has 3,821 followers on Mastodon.
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